'''
0下标起始，容易将同一下标分为左右2份，why
左边是小于，右边是大于等于
'''
l = [10, 20, 30, 40, 50, 60]
print(l[:2])
print(l[2:])
print(l[:3])
print(l[3:])

if __name__ == '__main__':
    print('done')
